Don't waste your time on a narrow band sensor. If you are trying to tune, forget it. If you want pretty lights go for it.
AEM does offer a wide band sensor (bosch) and UEGO controller with a display. It reads green, yellow, red AND digital in the middle. The display has a sensor for autodimming as well. I believe you can show voltage as well if you don't want 11-17.
install the a/f gauge pickup on the o2 before the cat...its is a 4wire heated o2 sensor the last time i got under ther eand looked....so u need to find the 4wires comming out and find the right one to tap to.....kragen or autozone or maybe one of the local toyota techs here could give us a wire diagram of the 02 sensor? then it would be easy
I have one in my car, an autometer a/f gauge. I tapped into the first o2 censor of the header. They are four wires but three of them are the same color I beleve grey you will just need to try them out and see which one works.